Combination auger and reamer



c. D. RAWLINSON, sR

COMBINATION AUGER AND REAMER Sept. 13, 1949.

5 Sheets-Sheet 1 Filed Dec. 8, 1945 luv CHARLES D. RAWLINSON5R,

Septo 13,. 19 1-9 RAVVLlNgON SR Zflflfifil COMBINATION AUGER ANDY REAMER Filed Dec. 8, 1945 V s Shets-Sheet 2 In: Q Y

lllllln Ag II I 5 NW H HI I!!! 1 HI /Z lln l Ili l H I /4 0 Inventor p p 1949' Y c. D. RAWLINSON SR 2,481,781

COMBINATION AUGER AND REAMER Filed Dec. 8, 1945 v 3 Sheets-Sheet 3 /i /7 Inventor CHARLES D. RAWLINSON SR,

Patented Sept. 13, 1949 UNITED S TAT ES PAT EINl-T F F ICE-'- 2,481,781

COMBINATION AUG'ER' AND 'REAMER Charles D. Rawlinson, Dallas, Teri;

Application December 8, 1945, Serial No."633',824 2 Claims. (cites-"46) This invention relates to' improvements in combined augers and reamers,"ar'id'more particularly to a aetieewmenwu1moreamore, and then reamsan enlargement or undercut at the base of the. hole, or at any desired level witliin'the vertical limit of the hole. v

An object of the invention is to' provide'an improved combination auger and reamer, which will be adapted to' bore a hole; and by -tripping a mechanism a reamer blade will be projected beyondthe lateral limit 'of the auger to're'am' an undercut at any level in the-hole. v

Another object of "the invention is to provide a combination auger and reamer with spaced guide rings for guiding the implement as it bores a hole, and with a pivoted reamer blade adapted to extend through a slot in the lower guide ring as it is projected to reaming position, or retracted to permit the auger to operate.

A still further object of the invention is to pro- Vide a highly eificient form of combination auger and reamer which may be manufactured and produced with a minimum of effort and expense.

Other objects will appear as the description proceeds.

In the accompanying drawings which form a part of this application,

Figure 1 is a front elevation of the combination auger and reamer in position to be used as an anger or drill;

Figure 2 is a front elevation of the combination auger and reamer in position to be used as a reamer;

Figure 3 is a side elevation of the combination auger and reamer taken at right angles to the view shown in Figure 1;

Figure 4 is a rear elevation of the combination auger and reamer as shown in Figure 1;

Figure 5 is a partial vertical sectional view taken through the combination auger and reameras shown in Figure 1;

Figure 6 is a plan view of the upper guiding ring for the combination auger and reamer, and

Figure '7 is a plan view looking down on the top of the lower guide ring, showing the relative positions of the auger cutting blade and the reamer blade.

Like characters of reference are used throughout the following specification and the accompanying drawings to designate corresponding parts.

In carrying out the invention, there is provided an upper cylindrical guide ring I having integrally-formed cross braces 2, and a depending tubular body 3, which is preferably square in cross-section, and is provided with the oppositely disposed slots 4 in its" sides.

A square drill rod 5. is adapted to be supported in the upper end of the body 3, and is .cross bored at 6, as is the said body to receive theicotter'. pin 1, which will extend through the aligned openings to hold the rod 5 securely in the body, 3, ,A lower drill shank 8, substantially square, in crosssection'is slidably received in" the lower fend of the body 3 and, is, cross-boredto receive the cross bolt l -w-hich extends thlgl hhthje .Oppoit l fili ll sad $19 ,.and t c ly thereof. The lower end of the drill shank 3 is pointed as at I0, as clearly shown in the drawings.

The combination guide ring or plate II is supported on the drill shank 8 at a point near the bottom thereof, and is provided with the downturned annular flange I 2, and the cooperating upturned lip l3 and a downturned lip l4 arranged in spaced relation to each other. An auger cutter blade I5 is secured in a slot I6 in the downturned lip I4, and is adjustably and interchangeably held therein by the single bolt I1 extending through the lip [4, slot l6 and blade 15. At a point substantially at right angles to the auger cutting blade I5, the plate II is slotted at l8 and formed with the upstanding flange I9 extending from the drill shank 8 to the outer edge of the said plate II. A reamer blade 20 is supported on the outer end of the arm 2|, which is pivoted at 22 to the lower end of the body 3, at right angles to the oppositely disposed slot 4, and at a point below said slot. A second or short arm 23 is pivoted at 24 to the lower end of the drill shank 8, below the plate II, and extends upwardly through the slot l8 to be pivotly secured at 25 to the reamer blade 20.

The lock or latch member 26 is pivoted at 21 on one side of the drill shank 8, and is formed with a finger 28 for operating the same.

From inspection of the drawings the mode of operation of the combination auger and reamer will be as follows:

When the reamer blade 26 is in its upraised or non-reaming position, as shown in Figure 1 of the drawings, the latch member 26 will be in upright position engaging the lower end of the body 3, to hold the reamer blade out of the way and elevated while the boring operation is taking place.

When it is desired to ream out an undercut, the latch member 26 will be moved from under the lower end of the body 3 to permit the reamer blade to move outwardly and downwardly beyond the lateral limits of the lower guide ring II, and

slightly below said guide ring I I, said adjustment causing the body 3 to move downwardly on the drill shank 8, until the cross bolt 9 is at the upp end of the guide slots 4, as shown in Figure 2 of the drawings.

It will be understood that a suitable poweroperated mechanism (not shown) will be attached to the drill rod to carry out the boring and reaming operations.

From the foregoing description, it will be apparent that there has been provided a highly efficient form of combination auger and reamer. which will be provided with the spaced guiding rings for guiding the implement as it progresses downwardly in its boring operation. It is obvious that when the reamer blade is in its outermost or cutting position, that an undercut may be made either at the bottom of the bored hole, or at any level within the limit of the hole.

It will be understood that it is not intended to limit the scope of the'invention to the specific embodiment thereof as described and illustrated,

' as many minor changes in detail of construction may be resorted to without departure from the spirit of the invention.

'Having thus described the invention what I claim as new and desire to secure :by Letters Patent of the United States is:

of said disk, a vertical tubular member having file of this patent:

4 opposed vertical slots, said tubular member slidably receiving said shank, a pin extending through said slots and the upper end of said shank, a reamer :blade, a first link secured at its lower end to said blade and pivoted at its upper end to said tubular member, a second link terminally pivoted to said blade and to the lower end of said shank beneath said disk, said blade moving through said guide slot, and. a releasable latch means for retaining said blade in an elevated inoperative position out of said guide slot and above said disk. 2. The combination of :claim 1, wherein said latch means includes a bar pivoted at one of its ends to said shank and a laterally extending lip on the other end of said bar adapted to support said tubular member at its lower end.

CHARLES D. RAWLINSON, SR.

REFERENCES CITED The following references are of recordin the UNITED STATES PATENT Number Name I Date 155,148 Eorstner j sepaza'iau 336,709 Forstner Feb. 23,1886 578,805 Annable Mar. 16,1397 833,240 Potter Oct. 16,1906 994,457 Green June 6, 19'11 1,049,151 Rotin-ofl' -1 Dec, 31,1912 1,091,502 Gearing Mar. 31, i914 2,142,859 

